Move inline stdlib imports (copy, time) to module top in orb engine

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/orb_trader/engine.py

@@ -14,8 +14,10 @@ Stop management logic mirrors orb_simulator.py:477-580 exactly.
 """
 from __future__ import annotations
 
+import copy
 import datetime as dt
 import logging
+import time
 import uuid
 from typing import Any
 from zoneinfo import ZoneInfo
@@ -347,7 +349,6 @@ class ORBTradingEngine:
                     for d in sorted(self._enrichment[ticker].keys(), reverse=True):
                         if d <= date_str:
                             # Create a date_str entry inheriting from latest
-                            import copy
                             self._enrichment[ticker][date_str] = copy.copy(
                                 self._enrichment[ticker][d]
                             )
@@ -579,7 +580,6 @@ class ORBTradingEngine:
             # Wait for fill (poll up to 30s)
             fill_price = entry_price_est
             order_rejected = False
-            import time
             for _ in range(6):
                 time.sleep(5)
                 try:
@@ -793,7 +793,6 @@ class ORBTradingEngine:
                 # (other sessions may hold the same ticker in the same Alpaca account).
                 exit_price = current_stop  # fallback if fill poll fails
                 try:
-                    import time
                     close_order = self._broker.close_position(ticker, qty=int(pos.shares))
                     # Poll for actual broker fill price (captures gap-through losses)
                     for _ in range(4):
@@ -863,7 +862,6 @@ class ORBTradingEngine:
             try:
                 # Use qty so only this session's shares are closed
                 close_order = self._broker.close_position(pos.ticker, qty=int(pos.shares))
-                import time
                 exit_price = pos.entry_price
                 for _ in range(4):
                     time.sleep(3)